Rotary baking-oven



C. O. LUCAS.

ROTARY BAKING OVEN.

APPLICATION H'LED JULY 25, 1919.

1 ,328 ,745. Patented Jan. 20, 1920.

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ROTARY BAKING OVEN.

APPLICATION FILED JULY 25, 1919.

"1,328,745. I Patented Jan. 20,1920.

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CHARLES 0. LUCAS, OF DAYTON, OHIO.

ROTARY BAKING-OVEN.

Specification of Letters Patent.

Patented Jan. 20, 1920.

Application filed July 25, 1919. Serial No. 313,163.

To all whom it may concern:

Be it known that 1, CHARLES 0. Lucas, a citizen of the United States, residing at Dayton, in the county of Montgomery and State of Ohio, have invented certain new and useful Improvements in Rotary Baking-Ovens, of which the following is a specification.

This invention relates to new and useful improvements in rotary baking ovens.

Une object of the invention is to provide a rotary baking oven in which a wide crevice is left between the upper and lower sections of the shell or drum, on both sidesof the latter, to permit the used heat to escape. During the baking operation, the heat generated by the burners passes quickly to the upper part of the shell, where, after giving forth the major portion of its calories, descends to the crevices through which it is permitted to escape.

Another object of the invention is the location of the oven door in the lower section of the shell, which eliminates any opening in the upper section of the shell through which heat may escape. This enables the heat to be retained in the upper shell section, where it is needed, and at the same time obviates the discomfort which results to a baker when the intense heat flares out into his face after he opens a door located in the upper section of the shell.

It is still another object of the invention to provide asbestos air-cell sheets that are placed crosswise between the inner and outer sheets of the shell, to form air pockets that effectively insulate the heat, or, in other words, cause it to be retained within the shell more completely than under present methods.

Another object of the invention is the provision of a window in the rear portion of the lower section of the shell for the purpose of viewing the movement of the reel while the bread is baking, and at the same time placing the glass in a position where it will not be broken by the intense heat in the upper section of the shell. By locating this glass window in the lower section of the shell, as well as providing the door in that section, the oven may be placed on legs which give it a greater altitude, thereby permitting the use of burners that are high enough above the floor to keep from the latter their intense heat.

' lower oven which contains It is a further object of the invention .to provide windows in one end portion of the shell section for observation purposes.

Other important and incidental objects will be brought out in the following specification and particularly set forth in the subjoined claim.

The preferred form of embodiment of my invention is illustrated in the accompanying drawings, of which Figure 1 is a perspective view of my improved rotary oven. Fig. 2 is an elevational View of that side thereof that contains the elongated window in the lower section of the shell. Fig. 3 is an end View of the oven, showing the two windows in the lower shell section. Fig. 4 is an enlarged sectional View taken through the shell sheets, showing the aircell asbestos strips between them. Fig. 5 is an elevational view of that side of the the door in its lower section. Fig. 6 is an enlarged elevational View of a portion of the door side of the oven. Fig. 7 is the same view thereof, with a portion of the outer casing broken away to reveal the interior mechanism. Fig. 8 is detail side view of the door hinge and heat stop. And Fig. 9 is an end view of the oven, showing the door hinge and one of the windows in the lower shell section.

Throughout the specification and drawings, similar reference characters denote corresponding parts.

Referring to the accompanying drawings, the numeral 1 designates the oven shell or drum which comprises an upper section 2 and a lower section 3 spaced a sufficient distance apart to leave a relatively wide crevice 4 between their walls. As has been stated before, this crevice permits the escape of the used heat, or that heat whose calories have been utilized in the upper section of the shell where they are most needed.

The lower section 3 of the shell is mounted upon legs 5 and 6 that are of a height to raise the burner line 7, which extends between them, a suflicient distance from the floor to keep their intense heat from the latter. This is made possible for the reasons heretofore given, and which will be more fully discussed when the door construction is taken up.

.Rotatable within the shell 1 is the usual reel construction 8 from which are suspended the rotatable baking shelves 9.

to be closed by an outwardly In the front portion of the lower shell section 3, directly belowthe front edge of the upper shell section 2, there is an elongated opening 10 of sufiicient size to permit the bread or other dough products to be removed through it from the shelves 9 as they pass the same. The opening 10 is adapted 11, the curvature of whose periphery conforms to that of the shell, and whose lower end is provided with a flanged stop portion 11. A glass window 12 is preferably provided in the middle portion of said door for observation purposes, while above the latter there is a handle 13 by means of which the door may be opened and closed.

Inclined downwardly from each lower corner portion of the door -11, is an inwardly-tapering hinge arm 14: that is pivotally secured, by means of a bolt 15, to a downwardly inclined lug 16 that has a circumferential flange 17 which is bolted to the peripheral edge of each end member 18 of the lower shell section 3. The position of the bolt 15 places the center of gravity a sufficient distance away from the shell to] permit the door 11 to be pressed by gravity against a heat stop member 19 within the shell at each side of the opening 10. Each heat stop member 19 comprises a metallic piece adj ustably secured to the end member 18 of the lower'shell section, in a position to project its bulged or beveled body portion sidewise into the opening 10 to permit the door end to impinge against it, with the result that when said door is in its closed position, it will bear tightly against these stop pieces 19 to seal any opening between the door and shell ends that would allow the escape of heat. Otherwise the'crevices which exist between the door ends and the shell to allow for their expansion, would permit a great ucai of heat to escape before its ascension to the top of the shell section 2, where is is most needed. (See Figs. 7 and 8.)

By locating the oven door in the lower section of the shell, I eliminate any opening in the upper shell section through which heat may escape. In their travel through the upper shell section, the baking shelves thus have the advantage of the heat that might otherwise escape through the door opening were it located there. Furthermore, the baker is not subjected to the discomfort when this intense heat flares out into his face through swinging door an opening provided for the door in the upper section of the shell. 1

Between the front corner edges of the end members 18 of the lower shell section 3, which are beveled, and the corner edges of the end members 20 of the upper shell section, which are also beveled, a suflicient space is left to allow for the expansion of those parts. In fact, this space is but an extension of the crevice 4;, which runs all the way around the oven, between the upper and lower sections, for the principal purpose of permitting the used heat to escape from the upper shell section.

Provided in the rear middle portion of the lower shell section 3, is an elongated window 21 through which the bread may be easily observed while it is baking. Furthermore, by placing the glass in the lower shell section, it is not exposed tothe intense heat of the upper one, and by which it is frequently broken when the window is posi tioned there. (See Fig. 2.)

For observation purposes, I also provide in one end of the lower shell section, two windows 22 and 23 which, though they are shown circular in shape, may be of any other form without departing from the spirit of the invention. (See Figs. 1 and 3.)

For the purpose of retaining the heat within the shell, I provide between the sheets 24 and 25 which form the wall of the latter, a series of asbestos air-cell strips 25 arranged crosswise; that is, the corrugations of an upper sheet cross, at preferably right angles, the corrugations of the sheet below. By such an arrangement of the asbestos sheets, air pockets are formed between them which insulate the heat, or cause it to be more effectively retained within the shell than where no such means are employed. (See Fig. 1.)

Having described my invention, I claim:

In a rotary oven, the combination with a lower shell section, of an upper shell section between which and the lower section a substantial crevice is left to permit the escape of used heat from the upper section of the shell.

In testimony whereof I have hereunto set my hand this 23rd day of July, 1919.

CHARLES O. LUCAS.

Witness HOWARD S. SMITH. 

